Those alternatives are not applicabile.

   -------- Original Message --------
   On 9/18/25 14:29, Genes Lists <li...@sapience.com> wrote:

     On Thu, 2025-09-18 at 09:19 +0000, Rupert Gallagher via dovecot wrote:

       Hello,
       I note the following problem. If the inbox holds many subfolders with
       mail,  thunderbird spends a lot of time on startup.

     Does seem a bit odd to attempt to limit/cripple the server when the flaw
     resides entirely with the client.
     I suggest instead that working to improve TB would be better approach.
     Engaging with the TB folks would probably be a good idea too.
     There may be things you can do on the TB side (make sure to use maildir
     for local storage - remove unnneeded offline folders etc).  It is also
     possible that reducing the number of sub folders could make TB worse,
     since then its index file would get even larger, have more "holes" and
     need manual "compressing" more frequently.  I found these index files
     got really really enormous - far larger than they should, likely as they
     left holes and tried to keep the file mostly append only.
     There were mumbings a long time ago about  them auto "compressing" their
     index file. Still, when I used TB I found I had to periodically stop TB
     - delete all index files (gigantic GB)- start TB -  wait a few minutes
     and things work better.  A work around for poor design for sure but it
     helped tb work a little faster.
     TB is just not a terribly good client inho.
     Alternatvely, switch clients to evolution (or something else) which
     works far better than tb. If some of your users are on mswin, there is
     outlook I guess.
     Either way, it really sounds like the better path for this problem is be
     to move on from TB or at least focus your energy on TB not the imap
     server.
     good luck - let us know how things work out.

 --

     Gene
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